Update READMEs

docker/README.md

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+# Docker images for OpenRAM #
+
+## Installing Docker ##
+
+There are a number of ways to install Docker.  Pick your favorite.
+
+* On Mac from docker.com with .app:
+ https://docs.docker.com/docker-for-mac/install/
+
+* On Windows from docker.com:
+ https://docs.docker.com/docker-for-windows/install/
+
+* On Ubuntu:
+ https://docs.docker.com/install/linux/docker-ce/ubuntu/
+
+NOTE: If you plan to use a VPN, do *NOT* use the Docker Toolbox for
+Mac or the docker from [Macports](https://www.macports.org/
+"Macports") as these require a network socket that breaks when you
+install some VPN software. To understand the difference, check out [this
+page](https://docs.docker.com/docker-for-mac/docker-toolbox/).
+
+## Running Docker ##
+
+### Terminal only ###
+
+* To run as a generic user:
+```
+make mount
+```
+
+## Updating the image ##
+
+If there are updates to the image, you can pull a new one from the hub with:
+```
+make pull
+```
+This is not automatically done, so if you have a problem, make sure you are up-to-date.
+
+## Building your own image ##
+
+You can run the build script to build a local image:
+
+```
+make build
+```
+
+If you want to change things, modify the openram-ubuntu/Dockerfile and let me know what should be fixed.